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  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></div></div> <!----></nav> <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Java Script</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/my-blog/blogs/JavaScript/01.html" class="sidebar-link">JavaScript基础</a></li><li><a href="/my-blog/blogs/JavaScript/02.html" aria-current="page" class="active sidebar-link">JavaScript基础—运算符</a></li><li><a href="/my-blog/blogs/JavaScript/03.html" class="sidebar-link">JavaScript基础—流程控制</a></li><li><a href="/my-blog/blogs/JavaScript/04.html" class="sidebar-link">/blogs/JavaScript/04.html</a></li><li><a href="/my-blog/blogs/JavaScript/05.html" class="sidebar-link">JavaScript基础—数组</a></li><li><a href="/my-blog/blogs/JavaScript/06.html" class="sidebar-link">JavaScript基础—函数</a></li><li><a href="/my-blog/blogs/JavaScript/07.html" class="sidebar-link">JavaScript基础—作用域</a></li><li><a href="/my-blog/blogs/JavaScript/08.html" class="sidebar-link">JavaScript基础—对象</a></li><li><a href="/my-blog/blogs/JavaScript/es-1.html" class="sidebar-link">面向过程与面向对象</a></li><li><a href="/my-blog/blogs/JavaScript/es-2.html" class="sidebar-link">构造函数和原型</a></li><li><a href="/my-blog/blogs/JavaScript/es-3.html" class="sidebar-link">函数的定义和调用</a></li><li><a href="/my-blog/blogs/JavaScript/es-4.html" class="sidebar-link">正则表达式概述</a></li><li><a href="/my-blog/blogs/JavaScript/es-5.html" class="sidebar-link">ES6相关概念</a></li></ul></section></li></ul> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-4e82dffc data-v-1156296a><h3 class="title" data-v-4e82dffc data-v-4e82dffc>JavaScript基础—运算符</h3> <!----> <label id="box" class="inputBox" data-v-4e82dffc data-v-4e82dffc><input type="password" value="" data-v-4e82dffc> <span data-v-4e82dffc>Konck! Knock!</span> <button data-v-4e82dffc>OK</button></label> <div class="footer" data-v-4e82dffc data-v-4e82dffc><span data-v-4e82dffc><i class="iconfont reco-theme" data-v-4e82dffc></i> <a target="blank" href="https://vuepress-theme-reco.recoluan.com" data-v-4e82dffc>vuePress-theme-reco</a></span> <span data-v-4e82dffc><i class="iconfont reco-copyright" data-v-4e82dffc></i> <a data-v-4e82dffc><span data-v-4e82dffc>Justic</span>
            
          <span data-v-4e82dffc>2019 - </span>
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        </a></span></div></div> <div data-v-1156296a><main class="page"><section><div class="page-title"><h1 class="title">JavaScript基础—运算符</h1> <div data-v-1ff7123e><i class="iconfont reco-account" data-v-1ff7123e><span data-v-1ff7123e>Justic</span></i> <i class="iconfont reco-date" data-v-1ff7123e><span data-v-1ff7123e>2019/9/22</span></i> <i class="iconfont reco-eye" data-v-1ff7123e><span id="/my-blog/blogs/JavaScript/02.html" data-flag-title="Your Article Title" class="leancloud-visitors" data-v-1ff7123e><a class="leancloud-visitors-count" style="font-size:.9rem;font-weight:normal;color:#999;"></a></span></i> <i class="tags iconfont reco-tag" data-v-1ff7123e><span class="tag-item" data-v-1ff7123e>JavaScript</span></i></div></div> <div class="theme-reco-content content__default"><h2 id="_1-运算符-操作符"><a href="#_1-运算符-操作符" class="header-anchor">#</a> 1 - 运算符（操作符）</h2> <h3 id="_1-1-运算符的分类"><a href="#_1-1-运算符的分类" class="header-anchor">#</a> 1.1 运算符的分类</h3> <div class="language- extra-class"><pre><code>	**运算符**（operator）也被称为操作符，是用于实现赋值、比较和执行算数运算等功能的符号。
</code></pre></div><div class="language-html line-numbers-mode"><pre class="language-html"><code>JavaScript中常用的运算符有：
- 算数运算符
- 递增和递减运算符
- 比较运算符
- 逻辑运算符
- 赋值运算符
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h3 id="_1-2-算数运算符"><a href="#_1-2-算数运算符" class="header-anchor">#</a> 1.2 算数运算符</h3> <ul><li><p>算术运算符概述</p> <p>概念：算术运算使用的符号，用于执行两个变量或值的算术运算。</p></li></ul> <p><img src="https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/48afbeeb733a4bbf8be59d973b7ef963~tplv-k3u1fbpfcp-watermark.image" alt="图片1.png"></p> <ul><li><p>浮点数的精度问题</p> <div class="language- extra-class"><pre><code>  浮点数值的最高精度是 17 位小数，但在进行算术计算时其精确度远远不如整数。
</code></pre></div><div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> result <span class="token operator">=</span> <span class="token number">0.1</span> <span class="token operator">+</span> <span class="token number">0.2</span><span class="token punctuation">;</span><span class="token comment">//结果是：0.30000000000000004</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token number">0.07</span> <span class="token operator">*</span> <span class="token number">100</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//结果是：7.000000000000001</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- extra-class"><pre><code>  所以：不要直接判断两个浮点数是否相等 ! 
</code></pre></div></li> <li><p>表达式和返回值</p> <div class="language- extra-class"><pre><code>  表达式：是由数字、运算符、变量等以能求得数值的有意义排列方法所得的组合

  简单理解：是由数字、运算符、变量等组成的式子

  表达式最终都会有一个结果，返回给开发者，称为返回值
</code></pre></div></li></ul> <h3 id="_1-3-递增和递减运算符"><a href="#_1-3-递增和递减运算符" class="header-anchor">#</a> 1.3 递增和递减运算符</h3> <ul><li><p>递增和递减运算符概述</p> <div class="language- extra-class"><pre><code>  	如果需要反复给数字变量添加或减去1，可以使用递增（++）和递减（ -- ）运算符来完成。

  在 JavaScript 中，递增（++）和递减（ -- ）既可以放在变量前面，也可以放在变量后面。放在变量前面时，我们可以称为前置递增（递减）运算符，放在变量后面时，我们可以称为后置递增（递减）运算符。

  注意：递增和递减运算符必须和变量配合使用。 
</code></pre></div></li> <li><p>递增运算符</p> <ul><li><p>前置递增运算符</p> <p>++num 前置递增，就是自加1，类似于 num =  num + 1</p> <p>使用口诀：先自加，后返回值</p></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span>  num <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token operator">++</span>num <span class="token operator">+</span> <span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">;</span>   <span class="token comment">// 21</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li><p>后置递增运算符</p> <p>num++ 后置递增，就是自加1，类似于 num =  num + 1</p> <p>使用口诀：先返回原值，后自加</p></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span>  num <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token function">alert</span><span class="token punctuation">(</span><span class="token number">10</span> <span class="token operator">+</span> num<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// 20</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li></ul> <h3 id="_1-4-比较运算符"><a href="#_1-4-比较运算符" class="header-anchor">#</a> 1.4 比较运算符</h3> <ul><li><p>比较运算符概述</p> <div class="language- extra-class"><pre><code>  	概念：比较运算符（关系运算符）是两个数据进行比较时所使用的运算符，比较运算后，会返回一个布尔值（true / false）作为比较运算的结果。
</code></pre></div></li></ul> <p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f5fab70b701447829b6e94465b3d1e38~tplv-k3u1fbpfcp-watermark.image" alt="图片2.png"></p> <ul><li>等号比较</li></ul> <p><img src="https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/36434be102394844980a5ed3fb284e50~tplv-k3u1fbpfcp-watermark.image" alt="图片3.png"></p> <div class="language-js line-numbers-mode"><pre class="language-js"><code>console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token number">18</span> <span class="token operator">==</span> <span class="token string">'18'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// true</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token number">18</span> <span class="token operator">===</span> <span class="token string">'18'</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_1-5-逻辑运算符"><a href="#_1-5-逻辑运算符" class="header-anchor">#</a> 1.5 逻辑运算符</h3> <ul><li><p>逻辑运算符概述</p> <div class="language- extra-class"><pre><code>  	逻辑运算符是用来进行布尔值运算的运算符，其返回值也是布尔值。后面开发中经常用于多个条件的判断
</code></pre></div></li></ul> <p><img src="https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/fd0d45cbcf11449c8e38919b02358d94~tplv-k3u1fbpfcp-watermark.image" alt="图片4.png"></p> <ul><li><p>逻辑与&amp;&amp;</p> <div class="language- extra-class"><pre><code>  两边都是 true才返回 true，否则返回 false
</code></pre></div></li></ul> <p><img src="https://p1-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/ce62870a86d14b04b0ff508f9b2dd49c~tplv-k3u1fbpfcp-watermark.image" alt="图片5.png"></p> <ul><li><p>逻辑或 ||</p> <div class="language- extra-class"><pre><code>  两边都是 true才返回 true，否则返回 false
</code></pre></div></li></ul> <p><img src="https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/c754027f811541d8a0d8b957002bbeb5~tplv-k3u1fbpfcp-watermark.image" alt="图片7.png"></p> <ul><li><p>逻辑非 ！</p> <div class="language- extra-class"><pre><code>  逻辑非（!）也叫作取反符，用来取一个布尔值相反的值，如 true 的相反值是 false
</code></pre></div><div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> isOk <span class="token operator">=</span> <span class="token operator">!</span><span class="token boolean">true</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>isOk<span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// false</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div></li> <li><p>短路运算（逻辑中断）</p> <div class="language- extra-class"><pre><code>  逻辑元素父左边的表达式值可以确定结果时，就不再继续运算右边的表达式的值;
</code></pre></div><ul><li><p>逻辑与</p> <div class="language- extra-class"><pre><code>语法： 表达式1 &amp;&amp; 表达式2

- 如果第一个表达式的值为真，则返回表达式2
</code></pre></div><ul><li>如果第一个表达式的值为假，则返回表达式1</li></ul></li></ul></li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code>      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">123</span> <span class="token operator">&amp;&amp;</span> <span class="token number">456</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>        <span class="token comment">// 456</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">0</span> <span class="token operator">&amp;&amp;</span> <span class="token number">456</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>          <span class="token comment">// 0</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">123</span> <span class="token operator">&amp;&amp;</span> <span class="token number">456</span><span class="token operator">&amp;&amp;</span> <span class="token number">789</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">// 789</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><ul><li><p>逻辑或</p> <p>语法： 表达式1 || 表达式2</p> <ul><li>如果第一个表达式的值为真，则返回表达式1</li> <li>如果第一个表达式的值为假，则返回表达式2</li></ul> <div class="language-js line-numbers-mode"><pre class="language-js"><code> console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">123</span> <span class="token operator">||</span> <span class="token number">456</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>         <span class="token comment">//  123</span>
   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">0</span> <span class="token operator">||</span>  <span class="token number">456</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>          <span class="token comment">//  456</span>
   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span> <span class="token number">123</span> <span class="token operator">||</span> <span class="token number">456</span> <span class="token operator">||</span> <span class="token number">789</span> <span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">//  123</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div></li></ul> <h3 id="_1-6-赋值运算符"><a href="#_1-6-赋值运算符" class="header-anchor">#</a> 1.6 赋值运算符</h3> <div class="language- extra-class"><pre><code>	概念：用来把数据赋值给变量的运算符。
</code></pre></div><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b2fb579b4ccf4ee38f77b3f8ef5dc942~tplv-k3u1fbpfcp-watermark.image" alt="图片9(1).png"></p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> age <span class="token operator">=</span> <span class="token number">10</span><span class="token punctuation">;</span>
age <span class="token operator">+=</span> <span class="token number">5</span><span class="token punctuation">;</span>  <span class="token comment">// 相当于 age = age + 5;</span>
age <span class="token operator">-=</span> <span class="token number">5</span><span class="token punctuation">;</span>  <span class="token comment">// 相当于 age = age - 5;</span>
age <span class="token operator">*=</span> <span class="token number">10</span><span class="token punctuation">;</span> <span class="token comment">// 相当于 age = age * 10;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h3 id="_1-7-运算符优先级"><a href="#_1-7-运算符优先级" class="header-anchor">#</a> 1.7 运算符优先级</h3> <p><img src="https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/124f80deea724597bea75cfb3068cf61~tplv-k3u1fbpfcp-watermark.image" alt="图片10.png"></p> <ul><li>一元运算符里面的逻辑非优先级很高</li> <li>逻辑与比逻辑或优先级高</li></ul></div></section> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">最后更新时间: </span> <span class="time">2021/9/9 下午2:38:31</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"><a href="/my-blog/blogs/JavaScript/01.html" class="prev">
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